About two months ago I set up a new 10 gal tank and a month later added 1 honey gourami and 3 rummynose tetras. I absolutely loved this gourami's peaceful and curious temperament so I decided I would purchase another one.
This is a photo that I took of my first gourami
Yesterday I picked up my second honey gourami and when I let him out of the bag everything seemed to start out okay. The original gourami was following the second one around, reaching out at him with his "feelers". The second gourami basically ignored this behavior and spent the next four hours exploring the tank. So far so good.
This is a photo I found online that looks nearly exactly like my new gourami. I am still unable to get a good picture of him because he is still shy of me.
Trouble started a few hours later. While I was sitting across the room watching TV I heard a splash come from the tank and figured I should probably investigate. When I checked out what was going on both gouramis were circling each other at the top of the tank. They were facing opposite directions nearly rubbing up against each other, but at the same time they seemed to be very aggressive and pecking at each other. The strangest thing is that the new gourami took on breeding colors (the black stripe on his bottom fin extended all the way through the face, etc)
I find this confusing because I was under the impression that I had two males in the tank. Do gouramis take on breeding colors when they are showing aggression to other fish in the tank? And are all female honey gouramis greyish brown? I am wondering if the first gourami in my tank might be a female even though it is yellow.
If they continue fighting should I bring the new one back to the
LFS?
Any help or ideas of what is going on and what I actions I should take would be much appreciated!
I should add that this has happened (as far as I know) only once so far. I have been monitoring them until late last night and once again earlier today. Last night they slept at opposite ends of the tank (the new gourami stole my original gouramis favorite sleeping spot!) and are now swimming on there own around the entire tank without any fights breaking out.
I am so confused! Did one of these guys insult the other guys mother yesterday and have now talked it out and made up?

I merged your posts. Thanks! Ken